US5277607A - Electrical connector with shorting contacts which wipe against each other - Google Patents
Electrical connector with shorting contacts which wipe against each other Download PDFInfo
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- US5277607A US5277607A US08/006,069 US606993A US5277607A US 5277607 A US5277607 A US 5277607A US 606993 A US606993 A US 606993A US 5277607 A US5277607 A US 5277607A
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- Prior art keywords
- contact
- protrusion
- point contact
- contact strips
- shorting contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
- H01R12/70—Coupling devices
- H01R12/71—Coupling devices for rigid printing circuits or like structures
- H01R12/72—Coupling devices for rigid printing circuits or like structures coupling with the edge of the rigid printed circuits or like structures
- H01R12/721—Coupling devices for rigid printing circuits or like structures coupling with the edge of the rigid printed circuits or like structures cooperating directly with the edge of the rigid printed circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/70—Structural association with built-in electrical component with built-in switch
- H01R13/703—Structural association with built-in electrical component with built-in switch operated by engagement or disengagement of coupling parts, e.g. dual-continuity coupling part
- H01R13/7031—Shorting, shunting or bussing of different terminals interrupted or effected on engagement of coupling part, e.g. for ESD protection, line continuity
- H01R13/7034—Shorting, shunting or bussing of different terminals interrupted or effected on engagement of coupling part, e.g. for ESD protection, line continuity the terminals being in direct electric contact separated by double sided connecting element
Definitions
- the present invention relates to shorting contacts for a printed circuit board assembly and more particularly to contacts which wipe against one another and engage one another at a final point contact.
- a mother board and one or more daughter boards are used to transfer signals between respective assemblies used in a computer or other electronic equipment.
- the mother and daughter boards may be arranged perpendicular to each other, as in an "edge card” configuration, depending upon the design of the overall product.
- Edge card connector contacts are formed on the mother card so that when the daughter card is removed, the opposing contacts come together to form an electrical shorting circuit.
- the reliability of these shorting contacts is very important to the efficiency of the overall equipment. Due to the environment in which the boards are located, there is the possibility of debris being collected at the interface between the mother board and the daughter board or of a film being formed on the opposing contacts on the mother card. In this type of situation, the electrical connection between the opposing contacts may be imperfect or unreliable and may result in malfunction of the electronic equipment.
- the known art utilizes opposing contacts which are usually bent or bowed members, parallel to one another which engage across the entire width of the respective contacts. Alternately a dimple has been used on a surface to obtain contact stress against the opposing contact.
- the present invention provides a reliable shorting circuit on the mother board by a high stress contact wherein the contacts are transverse to one another and wipe against one another before engaging at a final contact point.
- an electrical assembly which includes a printed circuit board alternately inserted and withdrawn between a pair of shorting contacts.
- the shorting contacts confront each other and are laterally-reversed mirror images of each other.
- Means are formed on each of the shorting contacts to assure an initial point contact therebetween. After the initial point contact, the shorting contacts wipe against each other and come to engage each other at a final point contact. The path from the initial point contact to the final point contact constitutes a line between the respective shorting contacts.
- the pair of shorting contacts for printed circuit board assembly includes a pair of contact strips, each of which has a longitudinal axis.
- a protrusion is formed on each of the contact strips.
- Each protrusion is substantially bisected frustum conical in shape.
- Each protrusion has a respective base and a respective top.
- Each protrusion is formed at an acute angle with respect to the longitudinal axis of the respective contact strip.
- the contact strips are in a side-by-side relationship so that their respective angled protrusions confront one another substantially in a transverse configuration. In this manner, the base of each protrusion is opposite the top of each confronting protrusion so that the respective sides of the confronting protrusions on the contact strips initially engage each other at an initial point contact. A very high stress concentration is provided therebetween.
- the contact strips thereafter wipe against each other and come to engage each other at a final point contact. The path from the initial point contact to the final point contact constitutes a line between the respective contact strips.
- a radiused protrusion is formed on each of the contact strips.
- the radiused protrusion is formed at an acute angle with respect to the longitudinal axis of the respective contact strip.
- the contact strips are in a side-by-side relationship so that their respective angled radiused protrusions confront one another substantially in a transverse configuration.
- the respective contact strips are twisted so that the contact strips initially engage each other at an initial point contact, thereby providing a very high stress concentration therebetween.
- the contact strips thereafter wipe against each other and come to engage each other at a final point contact.
- the path from the initial point contact to the final point contact constitutes a line between the respective contact strips.
- FIG. 1 is a perspective view of a mated pair of connector bodies showing the shorting contacts of the present invention.
- FIG. 2 is a perspective view or one connector body showing the right side of the shorting contact.
- FIG. 3 is a perspective view of the connector body of FIG. 2 showing the left side of the shorting contact.
- FIG. 4 is a side view of the connector body of FIG. 2.
- FIG. 5 is a partial front view of the connector body of FIG. 2 showing the shorting contact.
- FIGS. 6A-6B are end views of the mated pair of connector bodies of FIG. 1 showing the wiping movement of shorting contacts.
- FIG. 7 is a cross section view taken across the lines 7--7 of FIG. 6B.
- FIGS. 8A-8B are cross section views showing the insertion of a daughter beard between the mated connector bodies.
- FIG. 9 is a sketch showing contacting edges being substantially parallel to one another and the forces attendant thereto.
- FIG. 10 is a sketch showing contacting edges meeting at an angle with the forces attendant thereto.
- FIG. 11 is a perspective view of a mated pair of connector bodies showing the shorting contacts of another embodiment of the present invention.
- FIGS. 12A-12D are perspective views of the embodiment of FIG. 11 showing the forming of the shorting contacts.
- FIG. 13A-13C are end views of the embodiment of FIG. 11 showing the wiping movement of the shorting contacts.
- a plurality of connector bodies 10 are secured to a mother board 11.
- the connector body 10 is a strip of electrically conductive material (preferably beryllium copper) formed with a U-shaped bend 12 at the upper end, a front leg 13, a rear leg 14, an upper contact 15 at the approximate midpoint of the front leg 13 and a shorting contact 16 at the lower end of the front leg 13.
- the bent configuration of the connector body 10 provides a resiliency to the connector body 10 so that the shorting contact 16 is biased in a direction away from the rear leg 14.
- the connector bodies 10 are secured in mating opposing pairs wherein the respective upper contacts 15 and shorting contacts 16 are facing the corresponding contacts on the opposing connector body 10.
- the respective upper contacts 15 of the opposing connector bodies 13 are spaced apart and the respective shorting contacts 16 of the opposing connector bodies 10 are touching one another to provide an electrical connection (a shorting connection) between the mated connector bodies 10.
- a daughter board 17 having an electrical circuit thereon may be inserted between the mated connector bodies 10.
- the daughter board 17 initially makes electrical contact with the upper contacts 15 on the respective mating connector bodies 10.
- the opposing shorting contacts 16 are separated.
- the opposing shorting contacts 16 are urged together due to the resiliency of the respective connecting bodies 10 and a shorting type electrical connection is effected between the mated connecting bodies 10.
- the present invention is directed toward the shorting contacts 16 to assure a high reliability electrical connection.
- the development of a film such as an oxide or the deposition of debris such as dust on the engaging surfaces of the respective shorting contacts 16 are common causes of poor electrical contact.
- the present invention overcomes these problems.
- the shorting contact 16 is a protrusion 16 formed on the longitudinal axis of the contact strip.
- the protrusion 16 is in the shape of a bisected frustum cone having a base 20, a top 21, an upper side 22 and a lower side 23.
- the altitude of the protrusion 16 is between the base 20 and the top 21 and is also perpendicular to the longitudinal axis of the front leg 13.
- the upper side 22 is disposed at an angle of approximately 30°-60° with respect to the altitude of the protrusion 16 with a particularly preferred disposition of approximately 45°.
- the lower side 23 is disposed at an angle of approximately 0°-45° with respect to the altitude of the protrusion 16. In this manner, both sides 23, 24 of the protrusion 16 are disposed at an acute angle with respect to the longitudinal axis of the front leg 13.
- the respective protrusions 16 on the mated connector bodies 10 are laterally-reversed mirror images of one another. In this manner, the base 20 of the protrusion 16 on one connector body 10 is disposed opposite the top 21 of the protrusion 16 on the mated connector body 10 and the respective protrusions 16 confront one another in a transverse configuration.
- each respective protrusion 16 initially contact one another there is an initial contact point 25 on the curved edge of each respective protrusion 16. Due to the resiliency of the connector bodies 10, and there being only a point contact between the connector bodies 10, the contact point 25 is under high stress. Also due to said resiliency and the arcuate nature of the contacting edges of the respective protrusions 16, the protrusions 16 wipe against one another in a sliding movement and come to engage one another at a final contact point 26, the path between the initial contact point 25 and the final contact point 26 constituting a line.
- the shorting contacts move slightly sideways with respect to one another and then outwardly from one another in a letter "L" like movement.
- FIG. 9 shows the contacting edges being substantially parallel to one another as is common practice in the field.
- the spring force (S F ) is equal and opposite to the contact interface force.
- the interface force (I F ) is greater than the direct spring force (S FD ).
- S FD spring force direct
- F F friction force
- S FL spring force lateral
- I F interface force.
- the interface force is greater than the spring force. This can be viewed as a wedge effect. An increase in the force at the interface further increases the surface stress.
- the wiping movement between the respective protrusions consists of a moving point of contact which effectively overcomes any film or debris on the respective shorting contacts 16 and provides a highly reliable electrical contact.
- the shorting contacts 16 on the respective connecting bodies 10 are formed as a radiused protrusion 30 which is at an acute angle with respect to the longitudinal axis of the front leg 13 of the respective connecting body 10.
- the method of forming the radiused protrusion 30 is shown in FIGS. 12A-12D.
- the radiused protrusion 30 is formed in the connecting body at approximately 30°-60° with respect to longitudinal axis and at an especially preferred angle of 45°.
- the mated opposed connector body 10 also has a radiused protrusion 30 formed therein, the radiused protrusion being a laterally-reversed mirror image of the opposite and confronting radiused protrusion.
- the radiused protrusions on the mated connecting bodies 10 are at 90° with respect to one another.
- the respective front legs 13 of the connecting bodies are twisted through approximately 45° so that when the radiused protrusions 30, 30 on the respective bodies 10 contact one another, the angle of the contact is approximately 45°.
- the contact point is under high stress and due to the resiliency of the connecting bodies and the arcuate nature of the contacting edges, the protrusions wipe past one another in a sliding moving until the resilient forces equalize and the motion stops at a final contact point.
- the path between the initial contact point and the final contact point constitutes a line.
- the present invention provides features and advantages as follows: (1) contact between opposing shorting contacts is reliable, (2) point contact is made under high stress and (3) a wiping movement between the opposing shorting contacts overcomes film and debris on the contact surfaces.
Abstract
A pair of shorting contacts (16,16) on mated connector bodies (10,10). The shorting contacts are protrusions on the respective connector bodies which are laterally reversed mirror images of each other. The respective protrusions confront each other in a substantially transverse configuration. Initial engagement between the respective protrusions is at an initial point contact (25) at a high stress. The protrusions thereafter wipe against one another and come to engage at a final point contact (26). The path from the initial point contact to the final point contact constitutes a line between the respective connector bodies.
Description
The present invention relates to shorting contacts for a printed circuit board assembly and more particularly to contacts which wipe against one another and engage one another at a final point contact.
A mother board and one or more daughter boards are used to transfer signals between respective assemblies used in a computer or other electronic equipment. The mother and daughter boards may be arranged perpendicular to each other, as in an "edge card" configuration, depending upon the design of the overall product.
Edge card connector contacts are formed on the mother card so that when the daughter card is removed, the opposing contacts come together to form an electrical shorting circuit. The reliability of these shorting contacts is very important to the efficiency of the overall equipment. Due to the environment in which the boards are located, there is the possibility of debris being collected at the interface between the mother board and the daughter board or of a film being formed on the opposing contacts on the mother card. In this type of situation, the electrical connection between the opposing contacts may be imperfect or unreliable and may result in malfunction of the electronic equipment.
The following citations reflect the state of the art of which the applicant is aware insofar as these citations appear relevant to the present invention.
______________________________________ U.S. Pat. No. Inventor(s) Issue Date ______________________________________ 3,627,929 Gilissen et al 12/14/71 3,976,850 Faber et al 08/24/76 4,087,151 Robert et al 05/02/78 4,106,841 Vladic 08/15/78 4,285,565 Kirby 08/25/81 4,514,030 Triner et al 04/30/85 4,647,100 Crawford 03/31,87 5,098,306 Noschese et al 03/24/92 ______________________________________ Other Patent No. Issue Date ______________________________________ German 28 02 800 07/27/78 UK 2 133 938 08/01/84 PCT W085/04528 10/10/85 ______________________________________
The known art utilizes opposing contacts which are usually bent or bowed members, parallel to one another which engage across the entire width of the respective contacts. Alternately a dimple has been used on a surface to obtain contact stress against the opposing contact.
It is important to have opposing contacts which can reliably and simply effect an electrical connection when the daughter board is removed from the mother board and which can overcome film deposits and debris on the surfaces of the contacts.
The present invention provides a reliable shorting circuit on the mother board by a high stress contact wherein the contacts are transverse to one another and wipe against one another before engaging at a final contact point.
In accordance with the teachings of the present invention, there is disclosed herein an electrical assembly, which includes a printed circuit board alternately inserted and withdrawn between a pair of shorting contacts. The shorting contacts confront each other and are laterally-reversed mirror images of each other. Means are formed on each of the shorting contacts to assure an initial point contact therebetween. After the initial point contact, the shorting contacts wipe against each other and come to engage each other at a final point contact. The path from the initial point contact to the final point contact constitutes a line between the respective shorting contacts.
In a preferred embodiment, the pair of shorting contacts for printed circuit board assembly includes a pair of contact strips, each of which has a longitudinal axis. A protrusion is formed on each of the contact strips. Each protrusion is substantially bisected frustum conical in shape. Each protrusion has a respective base and a respective top. Each protrusion is formed at an acute angle with respect to the longitudinal axis of the respective contact strip. The contact strips are in a side-by-side relationship so that their respective angled protrusions confront one another substantially in a transverse configuration. In this manner, the base of each protrusion is opposite the top of each confronting protrusion so that the respective sides of the confronting protrusions on the contact strips initially engage each other at an initial point contact. A very high stress concentration is provided therebetween. The contact strips thereafter wipe against each other and come to engage each other at a final point contact. The path from the initial point contact to the final point contact constitutes a line between the respective contact strips.
In another preferred embodiment, a radiused protrusion is formed on each of the contact strips. The radiused protrusion is formed at an acute angle with respect to the longitudinal axis of the respective contact strip. The contact strips are in a side-by-side relationship so that their respective angled radiused protrusions confront one another substantially in a transverse configuration. The respective contact strips are twisted so that the contact strips initially engage each other at an initial point contact, thereby providing a very high stress concentration therebetween. The contact strips thereafter wipe against each other and come to engage each other at a final point contact. The path from the initial point contact to the final point contact constitutes a line between the respective contact strips.
These and other objects of the present invention will become apparent from a reading of the following specification, taken in conjunction with the enclosed drawings.
FIG. 1 is a perspective view of a mated pair of connector bodies showing the shorting contacts of the present invention.
FIG. 2 is a perspective view or one connector body showing the right side of the shorting contact.
FIG. 3 is a perspective view of the connector body of FIG. 2 showing the left side of the shorting contact.
FIG. 4 is a side view of the connector body of FIG. 2.
FIG. 5 is a partial front view of the connector body of FIG. 2 showing the shorting contact.
FIGS. 6A-6B are end views of the mated pair of connector bodies of FIG. 1 showing the wiping movement of shorting contacts.
FIG. 7 is a cross section view taken across the lines 7--7 of FIG. 6B.
FIGS. 8A-8B are cross section views showing the insertion of a daughter beard between the mated connector bodies.
FIG. 9 is a sketch showing contacting edges being substantially parallel to one another and the forces attendant thereto.
FIG. 10 is a sketch showing contacting edges meeting at an angle with the forces attendant thereto.
FIG. 11 is a perspective view of a mated pair of connector bodies showing the shorting contacts of another embodiment of the present invention.
FIGS. 12A-12D are perspective views of the embodiment of FIG. 11 showing the forming of the shorting contacts.
FIG. 13A-13C are end views of the embodiment of FIG. 11 showing the wiping movement of the shorting contacts.
With reference to FIG. 1-8, a first embodiment of the present invention is shown. A plurality of connector bodies 10 are secured to a mother board 11. The connector body 10 is a strip of electrically conductive material (preferably beryllium copper) formed with a U-shaped bend 12 at the upper end, a front leg 13, a rear leg 14, an upper contact 15 at the approximate midpoint of the front leg 13 and a shorting contact 16 at the lower end of the front leg 13. The bent configuration of the connector body 10 provides a resiliency to the connector body 10 so that the shorting contact 16 is biased in a direction away from the rear leg 14.
Preferably the connector bodies 10 are secured in mating opposing pairs wherein the respective upper contacts 15 and shorting contacts 16 are facing the corresponding contacts on the opposing connector body 10. In the normal condition, the respective upper contacts 15 of the opposing connector bodies 13 are spaced apart and the respective shorting contacts 16 of the opposing connector bodies 10 are touching one another to provide an electrical connection (a shorting connection) between the mated connector bodies 10. A daughter board 17 having an electrical circuit thereon may be inserted between the mated connector bodies 10. The daughter board 17 initially makes electrical contact with the upper contacts 15 on the respective mating connector bodies 10. As the daughter board 17 is further inserted, the opposing shorting contacts 16 are separated. Upon removal of the daughter board 17 from between the mated connector bodies 10, the opposing shorting contacts 16 are urged together due to the resiliency of the respective connecting bodies 10 and a shorting type electrical connection is effected between the mated connecting bodies 10.
The present invention is directed toward the shorting contacts 16 to assure a high reliability electrical connection. The development of a film such as an oxide or the deposition of debris such as dust on the engaging surfaces of the respective shorting contacts 16 are common causes of poor electrical contact. The present invention overcomes these problems.
In one preferred embodiment, the shorting contact 16 is a protrusion 16 formed on the longitudinal axis of the contact strip. The protrusion 16 is in the shape of a bisected frustum cone having a base 20, a top 21, an upper side 22 and a lower side 23. The altitude of the protrusion 16 is between the base 20 and the top 21 and is also perpendicular to the longitudinal axis of the front leg 13. The upper side 22 is disposed at an angle of approximately 30°-60° with respect to the altitude of the protrusion 16 with a particularly preferred disposition of approximately 45°. The lower side 23 is disposed at an angle of approximately 0°-45° with respect to the altitude of the protrusion 16. In this manner, both sides 23, 24 of the protrusion 16 are disposed at an acute angle with respect to the longitudinal axis of the front leg 13.
The respective protrusions 16 on the mated connector bodies 10 are laterally-reversed mirror images of one another. In this manner, the base 20 of the protrusion 16 on one connector body 10 is disposed opposite the top 21 of the protrusion 16 on the mated connector body 10 and the respective protrusions 16 confront one another in a transverse configuration.
As the respective protrusions 16 initially contact one another there is an initial contact point 25 on the curved edge of each respective protrusion 16. Due to the resiliency of the connector bodies 10, and there being only a point contact between the connector bodies 10, the contact point 25 is under high stress. Also due to said resiliency and the arcuate nature of the contacting edges of the respective protrusions 16, the protrusions 16 wipe against one another in a sliding movement and come to engage one another at a final contact point 26, the path between the initial contact point 25 and the final contact point 26 constituting a line. When the mated connector boards 10 are viewed from the end and as the daughter board 17 is inserted between the connector boards 19, the shorting contacts move slightly sideways with respect to one another and then outwardly from one another in a letter "L" like movement.
The advantage of having the contact surfaces at an angle with respect to one another is further shown in FIGS. 9 and 10. FIG. 9 shows the contacting edges being substantially parallel to one another as is common practice in the field. In this situation the spring force (SF) is equal and opposite to the contact interface force. However, when the opposing contacts meet at an angle with respect to one another (FIG. 10) the interface force (IF) is greater than the direct spring force (SFD). To illustrate, SFD is spring force direct, FF is friction force, SFL is spring force lateral, IF is interface force.
Let
Fx =any force component acting along X axis
FY =any force component acting along Y axis
Then, for system in static equilibrium: ΣFx =0 and ΣFY =0
As a reasonable example assume:
spring force direct SFD =50 grams
interface angleΘ=45°
coefficient of friction μ=0.2
______________________________________ Then ΣF.sub.Y = S.sub.FD - F.sub.F sin Θ - I.sub.F cos Θ = 0 Where F.sub.F = μI.sub.F So S.sub.FD - μI.sub.F sin Θ - I.sub.F cos Θ - 0 50 - .2 I.sub.F sin 45° - I.sub.F cos 45° = 0 50 - .1414 I.sub.F - .707 I.sub.F = 0 50 - .8485 I.sub.F = 0 I.sub.F = 58.9 grams, this is higher than S.sub.FD Also Σ F.sub.X = 0 Σ F.sub.X = S.sub.FL + F.sub.F cos Θ - I.sub.F sin Θ = 0 S.sub.FL + μI.sub.F cos Θ - I.sub.F sin Θ = 0 S.sub.FL + .2 (58.9) cos 45 - 58.9 sin 45 = 0 S.sub.FL + 8.3 - 41.6 = 0 S.sub.FL = 33.3 grams ______________________________________
As shown, the interface force is greater than the spring force. This can be viewed as a wedge effect. An increase in the force at the interface further increases the surface stress.
Thus, the wiping movement between the respective protrusions consists of a moving point of contact which effectively overcomes any film or debris on the respective shorting contacts 16 and provides a highly reliable electrical contact.
In another preferred embodiment (FIGS. 11-13) the shorting contacts 16 on the respective connecting bodies 10 are formed as a radiused protrusion 30 which is at an acute angle with respect to the longitudinal axis of the front leg 13 of the respective connecting body 10. The method of forming the radiused protrusion 30 is shown in FIGS. 12A-12D. The radiused protrusion 30 is formed in the connecting body at approximately 30°-60° with respect to longitudinal axis and at an especially preferred angle of 45°. The mated opposed connector body 10 also has a radiused protrusion 30 formed therein, the radiused protrusion being a laterally-reversed mirror image of the opposite and confronting radiused protrusion. In the preferred configuration, where the respective radiused protrusions 30, 30 are disposed at an angle of 45° with respect to the longitudinal axis of the front leg, the radiused protrusions on the mated connecting bodies 10 are at 90° with respect to one another. In order to further improve the reliability of the connection, the respective front legs 13 of the connecting bodies are twisted through approximately 45° so that when the radiused protrusions 30, 30 on the respective bodies 10 contact one another, the angle of the contact is approximately 45°. When the opposing radiused protrusions 30, 30 initially engage one another, there is an initial contact point on the curved edge of each respective protrusion 30. As in the previously described embodiment, the contact point is under high stress and due to the resiliency of the connecting bodies and the arcuate nature of the contacting edges, the protrusions wipe past one another in a sliding moving until the resilient forces equalize and the motion stops at a final contact point. The path between the initial contact point and the final contact point constitutes a line.
As will be appreciated by those skilled in the art, the present invention provides features and advantages as follows: (1) contact between opposing shorting contacts is reliable, (2) point contact is made under high stress and (3) a wiping movement between the opposing shorting contacts overcomes film and debris on the contact surfaces.
Obviously, many modifications may be made without departing from the basic spirit of the present invention. Accordingly, it will be appreciated by those skilled in the art that within the scope of the appended claims, the invention may be practical other than has been specifically described herein.
Claims (11)
1. In an electrical assembly, the combination of a printed circuit board alternately inserted and withdrawn between a pair of shorting contacts,
the shorting contacts confronting each other and being laterally-reversed mirror images of each other, and means formed on each of the shorting contacts to assure an initial point contact therebetween;
such that after the initial point contact, the shorting contacts wipe against each other and come to engage each other at a final point contact; and
such that the path from the initial point contact to the final point contact constitutes a line between the respective shorting contacts.
2. A pair of shorting contacts for a printed circuit board assembly, comprising a pair of contact strips, each of which has a longitudinal axis,
a protrusion on each of the contact strips, each protrusion being substantially bisected frustum conical in shape, each protrusion having a respective base and a respective top, each protrusion being formed at an acute angle with respect to the longitudinal axis of the respective contact strip,
the contact strips being in a side-by-side relationship so that their respective angled protrusions confront one another substantially in a transverse configuration,
wherein the base of each protrusion is opposite the top of each confronting protrusion so that the respective sides of the confronting protrusion on the contact strips initially engage each other at an initial point contact, thereby providing a very high stress concentration therebetween, and so that the contact strips thereafter wipe against each other and come to engage each other at a final point contact, and
such that the path from the initial point contact to the final point contact constitutes a line between the respective contact strips.
3. The shorting contacts of claim 2, wherein the acute angle is in the range of 30° to 60°.
4. The shorting contacts of claim 3, wherein the acute angle is approximately 45°.
5. The shorting contacts of claim 2, further comprising each protrusion having a respective side and a respective altitude between the base and the top, wherein an angle is formed on each protrusion between the respective side and the respective base, the angle being the same on each protrusion, the angle being in the range of 30° to 60°.
6. A pair of shorting contacts for a printed circuit board assembly, comprising a pair of contact strips, each of which has a longitudinal axis,
a radiused protrusion on each of the contact strips, the radiused protrusion being formed at an acute angle with respect to the longitudinal axis of the respective contact strip,
the contact strips being in a side-by-side relationship so that their respective angled radiused protrusions confront one another substantially in a transverse configuration,
and the respective contact strips being twisted so that the contact strips initially engage each other at an initial point contact, thereby providing a very high stress concentration therebetween,
and so that the contact strips thereafter wipe against each other and come to engage each other at a final point contact, and
such that the path from the initial point contact to the final point contact constitutes a line between there respective contact strips.
7. The shorting contacts of claim 6, wherein the acute angle is in the range of 30° to 60°.
8. The shorting contacts of claim 7, wherein the acute angle is approximately 45°.
9. The method of forming a pair of shorting contacts for a printed circuit board assembly, comprising the steps of
providing a pair of contact strips, each of which has a longitudinal axis,
forming a radiused protrusion on each of the contact strips, the radiused protrusion being formed at an acute angle with respect to the longitudinal axis of the respective contact strip,
arranging the contact strips in a side-by-side relationship so that their respective angled radiused protrusions confront one another substantially in a transverse configuration, and
twisting the respective contact strips so that the contact strips initially engage each other at an initial point contact, thereby providing a very high stress concentration therebetween, and so that the contact strips thereafter wipe against each other and come to engage each other at a final point contact, and such that the path from the initial point contact to the final point contact constitutes a line between the respective contact strips.
10. The method of claim 9, wherein the acute angle is in the range of 30° to 60°.
11. The method of clam 10, wherein the acute angle is approximately 45°.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/006,069 US5277607A (en) | 1993-01-15 | 1993-01-15 | Electrical connector with shorting contacts which wipe against each other |
US08/152,808 US5366382A (en) | 1993-01-15 | 1993-11-15 | Electrical connector with shorting contacts |
EP93309229A EP0606715B1 (en) | 1993-01-15 | 1993-11-18 | Electrical connector with shorting contacts which wipe against each other |
DE69325787T DE69325787T2 (en) | 1993-01-15 | 1993-11-18 | Electrical connector with short-circuit contacts that rub against each other |
JP6017042A JPH0750185A (en) | 1993-01-15 | 1994-01-17 | Electric contact and electric connector using it |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/006,069 US5277607A (en) | 1993-01-15 | 1993-01-15 | Electrical connector with shorting contacts which wipe against each other |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/152,808 Continuation-In-Part US5366382A (en) | 1993-01-15 | 1993-11-15 | Electrical connector with shorting contacts |
Publications (1)
Publication Number | Publication Date |
---|---|
US5277607A true US5277607A (en) | 1994-01-11 |
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Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/006,069 Expired - Lifetime US5277607A (en) | 1993-01-15 | 1993-01-15 | Electrical connector with shorting contacts which wipe against each other |
US08/152,808 Expired - Lifetime US5366382A (en) | 1993-01-15 | 1993-11-15 | Electrical connector with shorting contacts |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/152,808 Expired - Lifetime US5366382A (en) | 1993-01-15 | 1993-11-15 | Electrical connector with shorting contacts |
Country Status (4)
Country | Link |
---|---|
US (2) | US5277607A (en) |
EP (1) | EP0606715B1 (en) |
JP (1) | JPH0750185A (en) |
DE (1) | DE69325787T2 (en) |
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US5378164A (en) * | 1993-08-23 | 1995-01-03 | Minnesota Mining And Manufacturing Company | Tip for forcing contacts to wipe against each other |
US5470243A (en) * | 1994-02-17 | 1995-11-28 | The Whitaker Corporation | Electrical connector with snorting switch |
US5533907A (en) * | 1994-05-27 | 1996-07-09 | Methode Electronics, Inc. | Electronic module socket with self-cleaning shorting contacts |
US5575687A (en) * | 1995-07-27 | 1996-11-19 | Tsai; Chou-Hsuan | Edge board connector |
US5676570A (en) * | 1996-03-15 | 1997-10-14 | Minnesota Mining And Manufacturing Company | "F" port interface connector |
US6244881B1 (en) * | 1997-09-03 | 2001-06-12 | Sony Corporation | Connector, data processing apparatus, and network apparatus |
US6358061B1 (en) | 1999-11-09 | 2002-03-19 | Molex Incorporated | High-speed connector with shorting capability |
US6749449B2 (en) | 2001-08-30 | 2004-06-15 | Hubbell Incorporated | Safety receptacle with jacketed internal switches |
US6764345B1 (en) | 2003-05-27 | 2004-07-20 | Tyco Electronics Corporation | Electrical card edge connector with dual shorting contacts |
US20040223272A1 (en) * | 2003-02-03 | 2004-11-11 | Frantz Germain | Circuit interrupting device and system utilizing bridge contact mechanism and reset lockout |
US20050286183A1 (en) * | 2004-04-08 | 2005-12-29 | Frantz Germain | Circuit interrupting device with a single test-reset button |
US20060273859A1 (en) * | 2000-10-16 | 2006-12-07 | Frantz Germain | Reset lockout for sliding latch GFCI |
US20070049077A1 (en) * | 2005-08-31 | 2007-03-01 | Frantz Germain | Electrical wiring devices with a protective shutter |
US20070111569A1 (en) * | 2005-10-31 | 2007-05-17 | Frantz Germain | Tamper proof gfci |
US20070211397A1 (en) * | 2006-02-10 | 2007-09-13 | Stephen Sokolow | Tamper resistant ground fault circuit interrupter receptacle having dual function shutters |
US20070235300A1 (en) * | 2002-12-30 | 2007-10-11 | Frantz Germain | Ground fault circuit interrupter with blocking member |
US20080156512A1 (en) * | 2005-09-08 | 2008-07-03 | Cosmo Castaldo | Tamper-resistant electrical wiring device system |
US20080186116A1 (en) * | 1998-08-24 | 2008-08-07 | Disalvo Nicholas L | Circuit breaker with independent trip and reset lockout |
US20080186642A1 (en) * | 1998-08-24 | 2008-08-07 | Leviton Manufacturing Company, Inc. | Circuit interrupting device with reset lockout and reverse wiring protection and method of manufacture |
US7868719B2 (en) | 2006-02-10 | 2011-01-11 | Leviton Manufacturing Co., Inc. | Tamper resistant interrupter receptacle having a detachable metal skin |
US20110104919A1 (en) * | 2009-10-30 | 2011-05-05 | Leviton Mfg. Co. | Receptacle with antenna |
US20130090017A1 (en) * | 2010-01-08 | 2013-04-11 | Interconnect Portfolio Llc | Connector constructions for electronic applications |
US8435055B1 (en) | 2011-10-26 | 2013-05-07 | Leviton Manufacturing Co., Inc. | Tamper resistant electrical wiring device system |
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US9972928B1 (en) * | 2017-03-09 | 2018-05-15 | Mitsubishi Electric Corporation | Card edge connector |
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US9831588B2 (en) * | 2012-08-22 | 2017-11-28 | Amphenol Corporation | High-frequency electrical connector |
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- 1993-11-15 US US08/152,808 patent/US5366382A/en not_active Expired - Lifetime
- 1993-11-18 EP EP93309229A patent/EP0606715B1/en not_active Expired - Lifetime
- 1993-11-18 DE DE69325787T patent/DE69325787T2/en not_active Expired - Fee Related
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Cited By (63)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5378164A (en) * | 1993-08-23 | 1995-01-03 | Minnesota Mining And Manufacturing Company | Tip for forcing contacts to wipe against each other |
AU677070B2 (en) * | 1993-08-23 | 1997-04-10 | Minnesota Mining And Manufacturing Company | Tip for forcing contacts to wipe against each other |
US5470243A (en) * | 1994-02-17 | 1995-11-28 | The Whitaker Corporation | Electrical connector with snorting switch |
US5533907A (en) * | 1994-05-27 | 1996-07-09 | Methode Electronics, Inc. | Electronic module socket with self-cleaning shorting contacts |
US5575687A (en) * | 1995-07-27 | 1996-11-19 | Tsai; Chou-Hsuan | Edge board connector |
US5676570A (en) * | 1996-03-15 | 1997-10-14 | Minnesota Mining And Manufacturing Company | "F" port interface connector |
US6244881B1 (en) * | 1997-09-03 | 2001-06-12 | Sony Corporation | Connector, data processing apparatus, and network apparatus |
US20080186116A1 (en) * | 1998-08-24 | 2008-08-07 | Disalvo Nicholas L | Circuit breaker with independent trip and reset lockout |
US7907371B2 (en) | 1998-08-24 | 2011-03-15 | Leviton Manufacturing Company, Inc. | Circuit interrupting device with reset lockout and reverse wiring protection and method of manufacture |
US8054595B2 (en) | 1998-08-24 | 2011-11-08 | Leviton Manufacturing Co., Inc. | Circuit interrupting device with reset lockout |
US20080186642A1 (en) * | 1998-08-24 | 2008-08-07 | Leviton Manufacturing Company, Inc. | Circuit interrupting device with reset lockout and reverse wiring protection and method of manufacture |
US7545244B2 (en) | 1998-08-24 | 2009-06-09 | Leviton Manufacturing Co., Inc. | Circuit breaker with independent trip and reset lockout |
US8130480B2 (en) | 1998-08-24 | 2012-03-06 | Leviton Manufactuing Co., Inc. | Circuit interrupting device with reset lockout |
US6358061B1 (en) | 1999-11-09 | 2002-03-19 | Molex Incorporated | High-speed connector with shorting capability |
US8004804B2 (en) | 2000-10-16 | 2011-08-23 | Leviton Manufacturing Co., Inc. | Circuit interrupter having at least one indicator |
US20060273859A1 (en) * | 2000-10-16 | 2006-12-07 | Frantz Germain | Reset lockout for sliding latch GFCI |
US7492558B2 (en) | 2000-10-16 | 2009-02-17 | Leviton Manufacturing Co., Inc. | Reset lockout for sliding latch GFCI |
US20100039278A1 (en) * | 2000-10-16 | 2010-02-18 | Leviton Manfucturing Co., Inc. | Reset lockout for sliding latch gfci |
US6749449B2 (en) | 2001-08-30 | 2004-06-15 | Hubbell Incorporated | Safety receptacle with jacketed internal switches |
US7439833B2 (en) | 2002-12-30 | 2008-10-21 | Leviton Manufacturing Co., Ltd. | Ground fault circuit interrupter with blocking member |
US20070235300A1 (en) * | 2002-12-30 | 2007-10-11 | Frantz Germain | Ground fault circuit interrupter with blocking member |
US20040223272A1 (en) * | 2003-02-03 | 2004-11-11 | Frantz Germain | Circuit interrupting device and system utilizing bridge contact mechanism and reset lockout |
US7737809B2 (en) | 2003-02-03 | 2010-06-15 | Leviton Manufacturing Co., Inc. | Circuit interrupting device and system utilizing bridge contact mechanism and reset lockout |
US6764345B1 (en) | 2003-05-27 | 2004-07-20 | Tyco Electronics Corporation | Electrical card edge connector with dual shorting contacts |
DE102004025709B4 (en) | 2003-05-27 | 2022-06-02 | Te Connectivity Corporation | Card edge electrical connector with dual shorting contacts |
US20050286183A1 (en) * | 2004-04-08 | 2005-12-29 | Frantz Germain | Circuit interrupting device with a single test-reset button |
US7414499B2 (en) | 2004-04-08 | 2008-08-19 | Leviton Manufacturing Co., Inc. | Circuit interrupting device with a single test-reset button |
US7455538B2 (en) | 2005-08-31 | 2008-11-25 | Leviton Manufacturing Co., Inc. | Electrical wiring devices with a protective shutter |
US20070049077A1 (en) * | 2005-08-31 | 2007-03-01 | Frantz Germain | Electrical wiring devices with a protective shutter |
US7820909B2 (en) | 2005-09-08 | 2010-10-26 | Leviton Manufacturing Co., Inc. | Tamper-resistant electrical wiring device system |
US8242362B2 (en) | 2005-09-08 | 2012-08-14 | Leviton Manufacturing Co., Inc. | Tamper-resistant electrical wiring device system |
US20110028011A1 (en) * | 2005-09-08 | 2011-02-03 | Leviton Manufacturing Co., Inc. | Tamper-resistant electrical wiring device system |
US20080156512A1 (en) * | 2005-09-08 | 2008-07-03 | Cosmo Castaldo | Tamper-resistant electrical wiring device system |
US20070111569A1 (en) * | 2005-10-31 | 2007-05-17 | Frantz Germain | Tamper proof gfci |
US7651347B2 (en) | 2005-10-31 | 2010-01-26 | Leviton Manufacturing Co., Inc. | Tamper resistant mechanism with circuit interrupter |
US7868719B2 (en) | 2006-02-10 | 2011-01-11 | Leviton Manufacturing Co., Inc. | Tamper resistant interrupter receptacle having a detachable metal skin |
US7551047B2 (en) | 2006-02-10 | 2009-06-23 | Leviton Manufacturing Co., Inc. | Tamper resistant ground fault circuit interrupter receptacle having dual function shutters |
US20070211397A1 (en) * | 2006-02-10 | 2007-09-13 | Stephen Sokolow | Tamper resistant ground fault circuit interrupter receptacle having dual function shutters |
US7938676B1 (en) | 2009-10-30 | 2011-05-10 | Leviton Mfg. Co. | Receptacle with antenna |
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US20130090017A1 (en) * | 2010-01-08 | 2013-04-11 | Interconnect Portfolio Llc | Connector constructions for electronic applications |
US8444309B2 (en) | 2010-08-13 | 2013-05-21 | Leviton Manufacturing Company, Inc. | Wiring device with illumination |
US8435055B1 (en) | 2011-10-26 | 2013-05-07 | Leviton Manufacturing Co., Inc. | Tamper resistant electrical wiring device system |
US9109768B2 (en) * | 2013-02-04 | 2015-08-18 | UCP International Co. Ltd. | Illumination system |
US20140218925A1 (en) * | 2013-02-04 | 2014-08-07 | Hou Hua Han | Illumination system |
US10401011B2 (en) | 2013-02-04 | 2019-09-03 | UCP International Co. Ltd. | Illumination system |
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US9972928B1 (en) * | 2017-03-09 | 2018-05-15 | Mitsubishi Electric Corporation | Card edge connector |
US10517186B2 (en) | 2017-08-23 | 2019-12-24 | Sensata Technologies, Inc. | Socket |
US20190214754A1 (en) * | 2018-01-11 | 2019-07-11 | Te Connectivity Corporation | Card edge connector system |
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Also Published As
Publication number | Publication date |
---|---|
DE69325787D1 (en) | 1999-09-02 |
EP0606715A2 (en) | 1994-07-20 |
US5366382A (en) | 1994-11-22 |
DE69325787T2 (en) | 2000-02-10 |
EP0606715B1 (en) | 1999-07-28 |
EP0606715A3 (en) | 1996-01-17 |
JPH0750185A (en) | 1995-02-21 |
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